If youre playing a combo finisher such as Walking Ballista , the level 2 ability on Paladin Class can actually help you defer some of the cost of getting the combo out there in addition to level 1 helping protect you from interaction
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The first is energy counters , as exemplified by Satya, Aetherflux Genius
A card with madness gets discarded into exile
Ramunap Red Temur Energy UW Approach Sultai Energy Esper God-Pharaoh's Gift Tips, Tricks, and Card Interactions #1
While you can technically play this fairly, nobody will believe you, and you probably have a combo in the deck you didnt know about anyway